Centrifugal pump.



ma srnrns Parana ormoni.

.ironia a, reafirman, or cantano, camminata, Assrsnon To UNITED IRON Wonxsf or cantanti, oarirronnia, A CORPORATION or cnnrronlvrn.

cnnrnrrusan PUMP for'counter-balancing the end thrust of such pumps..

The. object of the invention is to provide a `hydraulic end thrust counter-balance for vertical shaft centrifugal pumps which on account of the conditions of operation must he arranged some distance. below the driving means.

Another ol ject of the invention is to provide a vertical shaft centrifugal pump provided with a lined hala-nce' and a variablehalance for supporting the runner in proper alinement with the case.

In verticalshaft centrifugal pumps'some means, other than mechanical hearings, mustbe employed to balance the weight of the runner, the shafting` andthe driving connections, in order to overcome excessive friction and wear. The pressure on opposite sides of the runner in the case is constantly varying, with the tendency to move the runner out of central alinement with the case and some means mustl also he provided for automatically counter-balancing such varying thrust in order to hold the runner in alinement. Y

Variable pressure counter-balance means have heretofore been arrangedin vertical shaft centrifugal pumps to support the en-` tire end thrust and to maintain the runner in central position but on account of the great weightwhich must be sustained in deep well pumps', the automat-ic balancing device has not Aheen able to accomplish its function with efficiency. Under suchconditions the area of thefsupporting pist-0n must he comparativelylarge and a large amount of water is necessary t'o produce the operation of the balance. According to my invention, however, I provide a calculated o-r fixed balance which operates in conjunction with a variable oalance. The calculated balance sup-V ports the greater l pero-entage of the end thrust, allowing the variable balance to sup 'a portthe remainder ofthe thrust and to take- Specification of Letters Patent.

Application filed December 2G, 1911.

Patented JanQl', 1913. Serial No. 6675758 care of the varying thrust due to the action o f the driving mechanism or the unequal pressure caused hy variations in the .suction or variationsin the discharge pressure. In this manner a greater thrust can he counterbalanced with greater eliiciency than would hepossihle-with a single nariahle pressure counter-halancingchamber, and the variable pressure balance is capable of finer adjust ment so-that it performs its function with greater etliciency.`

The invention possesses other advantageous features. which, with the` foregoing will be set forth at length in the following` description, where I shall outline in full that .form of the invention which I have selected for illustration in the `drawings accompanying and forming part of the present specification. The novelty of the inventionwill he included in the claims succeeding said description. From thisl it will he apparent that l do not restrict myself tothe showing made h v such draivings and descriptions as l may adopt many -variations Within the scope of my invention as expressed in said' claims.

Referring to the drawings :e-'Figure 1 is a vvertical section. of a vertical shaft centrif` ugzl pump showing the arrangement of the tv vo counter-.balance chambers of my invention. Fig. 2 is a vertical section through aA portion of the pump showing a modified form of the variable pressure counterhalance. 3 is a similar view showing another modification. f

My invention isparticularly adapted to he used in connection with vertical shaft centrifugal pumps and I have illustrated in the drawings, a simple or single stage vvery tical shaft pump, but it is to he understood that t-he invention is equally applicable to compound or multi-stage pumps. The pump consistsof a case 2 having the usual involute chamber ".suction inlets t and'discharge outlet 5.' llVithm thecase Q and 100 attache-d to the vertical shaft 6 is a runner or impeller 7' arranged so that it lies sub' stanti ally central of the case when the pump is in operation. Acollar 8, secured to the shaft 6 supports the shaft andthe runner 105 when the pump is not in operation and is so placed that it is lifted out .of Contact with the upper part of the pump framing 9 when the pump is iii operation.

The runner? is preferably provided onl 10 opposite sides with rlangjes til-13 which 'forni running: .n the case ant hold the inineller atined. 'che l2 on the upper side ot the runner forms a running ioint with the case 2. and the frange 13 on the side fornis a running` joint with the g ring lit secured to the ,i This le"- is prc'teralily formed sejniralne troni the puinp casing. so that it may he readily removed. vwhen worn and anew ring ii'iserted in its place. Attached to the plate l5, forniing the lauter part of the casing or to the ring let is a bottoni plate 1G haring` a central cylindrical' chaniher l? formed therein. into which the hollow cylindrical hloch 1S projects, forming a running joint therewith. `.block 18 is attached to or formed inr `with the Hang@ i3 of the runner and a passage. hetween the bottoni of her it? and the int rior ot the runner. The lenfrhs of the ange 13, the flange 19 on the t indrical block. and the ring l-l are prtiportfioned that an annular chamber 2l fined which is inelosed hy the plate itl. l le and the lgiloelrlt. Water under enters tl chamber through the joint bet en the flange 13 and the and i rar-ged theretroin through ning joint between the block 1S and ttl. The circuinferential lengths of l)ferent it is evident that e is accumulated in and exerts an upward pressure f the runner.. This arrangement is ire dependingv upon the relative Agr -f the two running joints and the areav ot the chamber. In )ractice l for-rn side7 hut'niay he arr e shaft and supported hy external means. this cylinder and securely attached Ihin 'it G a piston ,23 haring a conpag; of smaller dian'ictcr ornied noni. This 'plugseats in a chal'iilier 25, f hy its Vertical movement controls the outlet to the Variable 'pressure chamber Q6. Water under pressure is supplied to the eli-einher JG 'through the pipe 27 connected to the discharge 5. The pipe 27 is preferably provided with a. valve 28,` which may he adjusted to regulate the rate at which Water anat is terined a calculated balance, the upthe pass .Sres open.

and projectiredownward. troni the rosesse enters the chamber Q6 and consequently the pressure therein. lllhen the pressure within the case becomes unbalanced and the runner is moved upward, the plug Qlis withdrawn 'troni chamber allowing the water in chamber E26 to discharge prelerahly through portst) into the suction. thereby reducing the counter-balancing pressure in chamber Q6 and causing the runner to more downward to its central position. When the cylinder is arranged at sonic point removed from the punip casing', the water may discharge to the atmosphere or to a conductor extending downward into the well. The chan'iber Q5 niay be provided with an upstanding flange 3l. into which the plug Q4 tits and which is provided with one or incre, apertures 3Q, the outlet through which is controlled hy the plug. In such construction the plug is always seated within the ring and not liable to be displaced as inight occur in the construction shown in Fig. 3. wherein the plugr is moved entirely out ot the chainher :25.

As the puinp is operating. water from the variable pressure chamber 2G passes upward thro" ajh the running joint het-neen the piston and the cylinder 22 and enters the chaniher from which it rnust he discharged. l'this leakage water may he discharged through the external passage 35 connecting' the chamber with the suction et or it may he discharged through passages 35 in the plug 2l connecting the chamber with the chamber 25. In this construction.l which is the preferable one. the piston 23 formed with a recess 36 in its upper end into which The water leaking through the running joint, tiows into the re cess and downward into the pump, carrying with it all the sand which has passed through the joint. This arrangement removes all of the sand and thereby allows lthe piston 23 to work freely in the cylinder.

l claim:

l. In a Vertical shaft centrifugal pump, the combination of a case. arunner mounted upon the shaft and revoluble within the case, a suction inlet passage concentric with the shaft upon one side of the case, an annular iianre jr'ojocting from the runner into said inlet forming a running joint therein. a correspondin; liangc projecting from the opposite side ot the runner, a ehalnher in tl e case into which said flange extends and isreyoluble, a cylindrical block of smaller diameter 'than said tlange attached thereto and bearing` within the case forming an annular pressure chamber below the runner, inlet and outlet passages to said chamber, a cylinder concentric with the shaft ahoif'e said suction inlet. a piston attached to the shaft and reveluble within said cylinder, a pipe connecting the chamber in said cylinder below the piston with the pump discharge.

insonne and means operated buy the vertical movement of the piston for controlling the outlet to said chamber and the pressure therein.

2. In a vertical shaft centrifugal pump,

provided ,with a shaft adapted to be moved' the case below said runner, inlet and outlet passages to said chamber, a cylinder mounted on the case above said snction'inlet, a piston attached to the shaft and revoluble Within said cylinder, a pipe connecting the clian'iber in the cylinder below the piston with the pump dischargefa valve in said pipe, an outlet to said chamber in the cylinder and means on said piston for contr lling said outlet and the pressure in said chamber.

In a vertical shaft centrifugal pump, the combination of a case, a runner mounted upon theshaft and Vrevoluble within the case, a suction inlet passage concentric with Vthe shaft upon one side ol' the case, a chamber in thecase opposite thesuction inlet, a flange in/.the runner extending into and revoluble within said chamber, a` hollow cylindrical block of lesser diameterthan said flange `attached thereto and projecting into a correspondingly smaller chamber, a'n annular chamber between said block and the casing adjacent the discharge passage.,

A the chamber being` inconstant communication with said discharge and the interior of the runner, a cylinder mounted on said casing above the suction inlet, a piston attached to the shaft and revoluble in said cylinder, a pipe connect-ing the'ohamber in lthe cylinder below the piston with the pump discharge, a valve in said pipe, an'outlet passage 'for said chamber, a plug attached to said piston for controlling said passage,

and a passa 'e connecting the chamber above the piston with the suction inlet.

4. In a vertical shaft centrifugal pump,

the combination of .a case, a runner 1nounted upon'a 'shaft and. revoluble witliinthe case, a chamber in said case below the runner into which the central part ot' said runner extends, said chamber being in constant communication with the pressure area within the case and the .interior ot' the runner, a cylinder on said case above the suction inlet, a piston in 'said cylinder attached to theshaft and revoluble within said cylinder,y a pipe connecting the chamber in the cylinder below the piston with the pump discharge, means for regulating the flow of water through said pipe and a plug attached to said piston for controlling the outlet to said chamberand 'the pressure therein.

ln testimony whereof, l'. have hereunto set my hand at San Francisco, Cal., this 19th day of'December, v1911.

1 JOHN A. YEATMAN. ln presence oit- H. G. Pnosr, R. HEFFERNAN. 

